IOTA/IOTA-ES occultation update for (2387) Xi'an / UCAC4 288-214355 event on 2024 Oct 22, 18:16 UT Visible from Summary ------- On 2024 Oct 22 UT, the 20.5365727997168 km diameter asteroid (2387) Xi'an will occult a 10.3 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.20 mag to 17.46 mag (the magnitude of the asteroid) for at most 1.020 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 95 * date and approx. time of event: 2024 Oct 22, 18:11 - 2024 Oct 22, 18:21 * geocentric midpoint of event [JD]: 2460606.26161341 * magnitude of target star: 10.26 * magnitude drop [mag]: 7.20 * estimated maximum duration [s]: 1.020 * Moon: 66 % sunlit, 170° distance * Sun: 80° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 0.43 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 87°) * approx speed of asteroid's shadow [km/s]: 21.0858 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 288-214355 by 2387 Xi'an on 2024 Oct 22 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude -103 0 0 - 3 47 34 18 11 51.5 1 122 80 - 3 54 40 - 3 40 27 - 4 0 50 - 3 34 17 .... -102 0 0 - 4 25 11 18 11 51.6 2 122 81 - 4 32 15 - 4 18 6 - 4 38 23 - 4 11 57 -0.10 -101 0 0 - 5 2 13 18 11 51.9 3 122 82 - 5 9 15 - 4 55 10 - 5 15 22 - 4 49 2 -0.16 -100 0 0 - 5 38 39 18 11 52.3 4 122 83 - 5 45 40 - 5 31 38 - 5 51 45 - 5 25 32 -0.19 - 99 0 0 - 6 14 29 18 11 52.9 6 122 84 - 6 21 28 - 6 7 29 - 6 27 32 - 6 1 25 -0.20 - 98 0 0 - 6 49 42 18 11 53.5 7 122 85 - 6 56 39 - 6 42 44 - 7 2 41 - 6 36 41 -0.21 - 97 0 0 - 7 24 17 18 11 54.3 8 122 86 - 7 31 13 - 7 17 21 - 7 37 13 - 7 11 20 -0.22 - 96 0 0 - 7 58 14 18 11 55.3 9 122 86 - 8 5 8 - 7 51 20 - 8 11 7 - 7 45 20 -0.22 - 95 0 0 - 8 31 32 18 11 56.3 10 122 86 - 8 38 25 - 8 24 40 - 8 44 22 - 8 18 42 -0.23 - 94 0 0 - 9 4 12 18 11 57.4 11 121 86 - 9 11 2 - 8 57 21 - 9 16 58 - 8 51 24 -0.23 - 93 0 0 - 9 36 12 18 11 58.7 12 121 86 - 9 43 1 - 9 29 23 - 9 48 55 - 9 23 28 -0.24 - 92 0 0 -10 7 32 18 12 0.1 13 121 85 -10 14 19 -10 0 45 -10 20 12 - 9 54 51 -0.24 - 91 0 0 -10 38 12 18 12 1.5 15 121 84 -10 44 58 -10 31 27 -10 50 49 -10 25 35 -0.24 - 90 0 0 -11 8 12 18 12 3.1 16 121 83 -11 14 56 -11 1 28 -11 20 46 -10 55 38 -0.24 - 89 0 0 -11 37 32 18 12 4.8 17 121 82 -11 44 13 -11 30 50 -11 50 2 -11 25 0 -0.24 - 88 0 0 -12 6 10 18 12 6.6 18 120 81 -12 12 50 -11 59 30 -12 18 38 -11 53 42 -0.24 - 87 0 0 -12 34 8 18 12 8.5 19 120 80 -12 40 47 -12 27 29 -12 46 32 -12 21 43 -0.25 - 86 0 0 -13 1 25 18 12 10.4 20 120 79 -13 8 2 -12 54 48 -13 13 46 -12 49 3 -0.25 - 85 0 0 -13 28 1 18 12 12.5 21 120 78 -13 34 36 -13 21 25 -13 40 19 -13 15 42 -0.25 - 84 0 0 -13 53 56 18 12 14.7 22 120 77 -14 0 29 -13 47 22 -14 6 11 -13 41 39 -0.25 - 83 0 0 -14 19 9 18 12 16.9 23 119 76 -14 25 41 -14 12 37 -14 31 21 -14 6 56 -0.25 - 82 0 0 -14 43 41 18 12 19.3 24 119 75 -14 50 12 -14 37 11 -14 55 51 -14 31 31 -0.25 - 81 0 0 -15 7 33 18 12 21.7 25 119 74 -15 14 2 -15 1 3 -15 19 40 -14 55 25 -0.25 - 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56 0 0 -21 25 36 18 13 43.9 50 115 49 -21 31 40 -21 19 32 -21 36 56 -21 14 16 -0.27 - 55 0 0 -21 32 14 18 13 47.9 50 115 48 -21 38 17 -21 26 11 -21 43 33 -21 20 55 -0.27 - 54 0 0 -21 38 14 18 13 51.9 51 115 47 -21 44 17 -21 32 11 -21 49 32 -21 26 55 -0.27 - 53 0 0 -21 43 36 18 13 56.0 52 115 46 -21 49 38 -21 37 33 -21 54 53 -21 32 18 -0.27 - 52 0 0 -21 48 19 18 14 0.1 53 115 45 -21 54 22 -21 42 17 -21 59 36 -21 37 2 -0.27 - 51 0 0 -21 52 25 18 14 4.3 54 116 44 -21 58 27 -21 46 23 -22 3 41 -21 41 8 -0.27 - 50 0 0 -21 55 53 18 14 8.5 55 116 44 -22 1 55 -21 49 51 -22 7 9 -21 44 37 -0.27 - 49 0 0 -21 58 43 18 14 12.8 56 116 43 -22 4 44 -21 52 41 -22 9 58 -21 47 27 -0.27 - 48 0 0 -22 0 55 18 14 17.1 57 116 42 -22 6 56 -21 54 53 -22 12 10 -21 49 39 -0.27 - 47 0 0 -22 2 29 18 14 21.4 57 116 41 -22 8 30 -21 56 28 -22 13 44 -21 51 14 -0.27 - 46 0 0 -22 3 26 18 14 25.8 58 117 40 -22 9 27 -21 57 24 -22 14 40 -21 52 10 -0.27 - 45 0 0 -22 3 44 18 14 30.2 59 117 39 -22 9 45 -21 57 43 -22 14 59 -21 52 29 -0.27 - 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8 23 17 - 8 9 26 - 8 29 18 - 8 3 25 -0.26 6 0 0 - 7 42 7 18 18 55.8 59 213 -13 - 7 49 5 - 7 35 10 - 7 55 7 - 7 29 7 -0.26 7 0 0 - 7 7 12 18 19 1.2 58 214 -14 - 7 14 11 - 7 0 13 - 7 20 15 - 6 54 8 -0.26 8 0 0 - 6 31 37 18 19 6.7 57 215 -15 - 6 38 38 - 6 24 36 - 6 44 43 - 6 18 30 -0.26 9 0 0 - 5 55 22 18 19 12.1 56 215 -16 - 6 2 25 - 5 48 19 - 6 8 32 - 5 42 11 -0.26 10 0 0 - 5 18 28 18 19 17.4 55 216 -17 - 5 25 33 - 5 11 23 - 5 31 41 - 5 5 14 -0.26 11 0 0 - 4 40 56 18 19 22.7 54 217 -18 - 4 48 2 - 4 33 49 - 4 54 13 - 4 27 38 -0.26 12 0 0 - 4 2 46 18 19 28.0 53 217 -19 - 4 9 54 - 3 55 37 - 4 16 6 - 3 49 24 -0.26 13 0 0 - 3 23 59 18 19 33.2 52 218 -21 - 3 31 9 - 3 16 48 - 3 37 23 - 3 10 34 -0.26 14 0 0 - 2 44 36 18 19 38.4 51 218 -22 - 2 51 48 - 2 37 23 - 2 58 3 - 2 31 8 -0.26 15 0 0 - 2 4 38 18 19 43.5 50 218 -23 - 2 11 52 - 1 57 24 - 2 18 9 - 1 51 6 -0.26 16 0 0 - 1 24 6 18 19 48.5 48 219 -24 - 1 31 22 - 1 16 50 - 1 37 40 - 1 10 31 -0.26 17 0 0 - 0 43 1 18 19 53.5 47 219 -25 - 0 50 19 - 0 35 44 - 0 56 39 - 0 29 23 -0.26 18 0 0 - 0 1 25 18 19 58.4 46 220 -26 - 0 8 44 0 5 55 - 0 15 5 0 12 17 -0.26 19 0 0 0 40 42 18 20 3.2 45 220 -27 0 33 21 0 48 4 0 26 59 0 54 27 -0.26 20 0 0 1 23 19 18 20 7.9 44 220 -29 1 15 56 1 30 42 1 9 32 1 37 7 -0.26 21 0 0 2 6 24 18 20 12.6 42 221 -30 1 58 59 2 13 48 1 52 34 2 20 15 -0.26 22 0 0 2 49 55 18 20 17.1 41 221 -31 2 42 29 2 57 21 2 36 2 3 3 49 -0.26 23 0 0 3 33 51 18 20 21.5 40 221 -32 3 26 23 3 41 19 3 19 55 3 47 48 -0.26 24 0 0 4 18 11 18 20 25.9 39 222 -33 4 10 42 4 25 40 4 4 12 4 32 10 -0.26 25 0 0 5 2 52 18 20 30.1 38 222 -34 4 55 22 5 10 23 4 48 51 5 16 54 -0.26 26 0 0 5 47 54 18 20 34.3 36 222 -35 5 40 23 5 55 26 5 33 51 6 1 59 -0.26 27 0 0 6 33 15 18 20 38.3 35 222 -37 6 25 42 6 40 48 6 19 9 6 47 22 -0.26 28 0 0 7 18 52 18 20 42.2 34 223 -38 7 11 18 7 26 27 7 4 44 7 33 1 -0.26 29 0 0 8 4 44 18 20 45.9 33 223 -39 7 57 9 8 12 20 7 50 34 8 18 56 -0.26 30 0 0 8 50 50 18 20 49.6 31 223 -40 8 43 14 8 58 27 8 36 38 9 5 3 -0.26 31 0 0 9 37 7 18 20 53.1 30 224 -41 9 29 29 9 44 44 9 22 53 9 51 22 -0.26 32 0 0 10 23 33 18 20 56.5 29 224 -42 10 15 54 10 31 11 10 9 17 10 37 50 -0.26 33 0 0 11 10 6 18 20 59.7 28 224 -43 11 2 27 11 17 45 10 55 49 11 24 25 -0.26 34 0 0 11 56 45 18 21 2.8 26 224 -44 11 49 5 12 4 25 11 42 26 12 11 5 -0.26 35 0 0 12 43 27 18 21 5.8 25 225 -45 12 35 47 12 51 8 12 29 7 12 57 48 -0.26 36 0 0 13 30 11 18 21 8.7 24 225 -46 13 22 30 13 37 52 13 15 50 13 44 33 -0.26 37 0 0 14 16 54 18 21 11.4 23 225 -47 14 9 13 14 24 36 14 2 32 14 31 17 -0.26 38 0 0 15 3 35 18 21 13.9 21 226 -48 14 55 53 15 11 17 14 49 12 15 17 59 -0.25 39 0 0 15 50 11 18 21 16.3 20 226 -49 15 42 29 15 57 53 15 35 48 16 4 35 -0.25 40 0 0 16 36 41 18 21 18.6 19 226 -50 16 28 58 16 44 23 16 22 17 16 51 5 -0.25 41 0 0 17 23 2 18 21 20.7 18 227 -51 17 15 20 17 30 45 17 8 38 17 37 27 -0.25 42 0 0 18 9 13 18 21 22.6 16 227 -52 18 1 31 18 16 56 17 54 50 18 23 38 -0.25 43 0 0 18 55 12 18 21 24.4 15 227 -53 18 47 30 19 2 55 18 40 49 19 9 37 -0.25 44 0 0 19 40 57 18 21 26.1 14 228 -54 19 33 15 19 48 40 19 26 34 19 55 22 -0.25 45 0 0 20 26 27 18 21 27.6 13 228 -55 20 18 45 20 34 9 20 12 4 20 40 51 -0.25 46 0 0 21 11 39 18 21 29.0 12 228 -55 21 3 57 21 19 21 20 57 16 21 26 2 -0.25 47 0 0 21 56 31 18 21 30.3 10 229 -56 21 48 50 22 4 13 21 42 10 22 10 54 -0.25 48 0 0 22 41 3 18 21 31.4 9 229 -57 22 33 23 22 48 44 22 26 43 22 55 25 -0.25 49 0 0 23 25 13 18 21 32.3 8 230 -58 23 17 33 23 32 53 23 10 54 23 39 33 -0.25 50 0 0 24 8 59 18 21 33.2 7 230 -58 24 1 19 24 16 39 23 54 41 24 23 18 -0.25 51 0 0 24 52 19 18 21 33.8 6 230 -59 24 44 41 24 59 58 24 38 3 25 6 37 -0.25 52 0 0 25 35 13 18 21 34.4 5 231 -59 25 27 35 25 42 52 25 20 58 25 49 30 -0.25 53 0 0 26 17 39 18 21 34.8 3 231 -60 26 10 3 26 25 17 26 3 26 26 31 54 -0.24 54 0 0 26 59 37 18 21 35.1 2 232 -60 26 52 1 27 7 13 26 45 25 27 13 49 -0.24 55 0 0 27 41 3 18 21 35.3 1 232 -61 27 33 29 27 48 39 27 26 54 27 55 14 -0.22 56 0 0 28 21 59 18 21 35.4 0 233 -61 28 14 25 .. .. .. 28 7 52 .. .. .. 0.53 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 288-214355 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 30 30.8365 DE: -32 25 06.869 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 30 30.8365 DE: -32 25 06.869 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 10.3 * B mag [mag]: 11.9 * Diameter [mas]: 0.40 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2387) Xi'an asteroid class: approx. diameter [km]: 21 approx. diameter ["]: 0.009 distance from Earth [AU]: 3.23130 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#50 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.013", 0.002", 86.602° remarks: * orbital elements for (2387)Xi'an : Mean anomaly = 216.6183462447 deg Arg. of pericenter = 42.7792005816 deg Long. of node = 53.0270213398 deg Inclination = 10.9467699283 deg Eccentricity = 0.0755056900 Semimajor axis = 3.0222309181 AU Perihelion dist = 2.7940352873 AU Mag: H = 11.45, G = 0.15 Epoch of elements : MJD 60605.76161313 TDT (2024 Oct 22.7616) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr24,1.02,2024,10,22,18.278722,-0.084954,0.245640,11.253338,3.873824,0.005762,0.000733,0.000000,0.000000 -12.8236,-32.3687,-98.09,-11.42,False UCAC4 288-214355,19.50856572,-32.4185746,11.88,10.26,9.39,0.4,4,,19.53505363,-32.3686521,7.20,7.62,0,0,0 2387,Xi'an,17.46,21.474,3.2313,0,0,2.418,10.54,,2.0,0 0,216.4755,2024,10,22,42.7792,53.0270,10.9468,0.07551,3.02223,2.79404,11.45,5.0,0.15 1.434,0.0127,0.0021,87,0.0040,Known errors,1.35,0,-1,-1 20241022_214355,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org